Brake



March 19, 1935. KOHR 1,994,823

BRAKE Filed June 30, 1930 2 Sheets-Sheet l INVENTOR.

March 19, 1935. F, R 1,994,823

BRAKE File'd June so, 1930 2 Sheets-Sheet 2 r INVENTOR. Wobri 17/119122BY ATTORNEY Patented Mar. 19,. 1935 x UNITED STATES PATENT OFFICE BRAKERobert F. Kohr, South Bend, Ind., assignor to Bendix Brake Company,South Bend, Ind., a.

corporation of Illinois Application June 30, 1930, Serial No. 464,730 8Claims. (Cl. 188-78) This invention relates to brakes and moreparsecured against lateral movement by the steady ticularly to internalexpanding brakes. rest 13 and the secondary shoe is secured against Anobject of the invention is to generally irnlateral movement by thesteady rest 14. prove brake structures by a substantial reduction Theseshoes are of the conventional type, each in the number of parts thereofand by simplificacomprising a rim 17 and a web 18, the rim having 5 tionof the various parts in the assembly. secured thereto a suitable lining19 adaptable for Another object of the invention is to provide aengagement with the interior of the drum. The brake structure, thevarious parts of which may be articulated ends of the shoes areconnected by a stamped from sheet material, thereby reducing suitableadjustment device indicated generally the cost of production. at 20 andthe separable ends of the shoes are pro- 10 A further object of theinvention is to provide vided with shoulders 21 and 22 embracing the abrake structure in which the amount of required anchor 12. machineoperation on the parts during manufac- As shown, the shoes are connectedadjacent ture shall be materially reduced. their separable ends by areturn spring 23 which Yet a further object of the invention is topronormally retains the shoes in engagement with 15 vide a brakestructure which is highly efhcient in the anchor where they aresupported in spaced operation and yet of marked simplicity as a wholerelation to the interior of the drum. in respect to each of itscomponent parts, so that The primary and secondary shoes 15 and 16 areits manufacture may be economically facilitated interchangeable. Thewebs forming these shoes both as regards the parts and their assembly.have at their separable ends an offset portion pro- 20 An importantfeature of the invention is a vided with a notch adapted to embrace theanchor single anchor for the friction elements. and immediately adjacentthe rim, the web is Another feature of the invention is theparticunotched as indicated at 24 and the rim immedilar structure of theoperating means. ately adjacent the notch 24 is deformed so that 25 Yetanother feature of the invention is a it may co-operatewith the notch 24to provide a 25 novel adjustment member for the articulated ends slot25, the object of which will hereinafter apof the friction elements.pear. In this connection, it should be observed Other objects andfeatures of the invention rethat the web.of the shoe constitutes asingle side in the various combinations hereinafter destamping suitablysecured to the rim. However, scribed and claimed as will be apparentupon refit is to be understood that no such limitation is 30 erence tothe following specification and to the to be imposed in the presentstructure.

accompanying drawings, in which: Mounted on the rims of the frictionelements Figure 1 is a vertical sectional view of a brake are studs 26and positioned on the studs for roembodying the invention; tation arerollers 2'7 and 28. These rollers are Figure 2 is a sectionsubstantially on line 2--2, of different diameters, the larger rollers28 having 35 Figure 1; frictional. contact with the backing plate andthe Figure 3 is a section substantially on line 33, smaller rollers areadapted to receive the thrust Figure 1; of a wedge-shaped member 29,which is held in Figure 4 is a perspective view of one of the positionon the rollers 27 by the rollers 28 and the 0 steady rests; adjacentends of the rims 17. This member is Figure. 5 is a modificationillustrating the insuitably secured to an operating cable 30.

vention as applied to a band friction element. As shown, a bracket 31 issecured on the back- Figure 6 is a perspective view of the adjustingplate as by bolts 32 and suitably secured to ment for the articulatedends of the friction elethe bracket is a sheath 33 housing the operating5 ments; and I cable 30 and positioned on the cable 30 between Figure 7is a 1 p View O t e perating the bracket and the member 29 is a coilspring 34. means partly broken away. This spring serves to disengage themember 29 Referring to the drawings for more specific on release of theapplied force on the operating details of the invention, 10 represents astationcable 30.

ary support such as a backing plate having asso- The adjustment devicefor connecting the ar- 50 ciated therewith a rotatable drum 11.Positioned ticulated ends of the shoes comprises a stamping on thebacking plate is an anchor 12 and steady bent on itself to provide anenvelope 35 having rests 13 and 14. As shown, a primary shoe 15 parallelside portions 36 and 37 and a tubular and a secondary shoe 16 aremounted for movecenter portion 38. Two corresponding stampment on thebacking plate. The primary shoe is ,ings having semicircular centerportions 39 and" -fianged portions 40 and 41 are positioned for movementin the circular body portion 38 of the envelope. These stampings haveoppositely di-- verging edges 42 and their semicircular portions areinternally threaded to receive a screw 43 provided with a toothed head44.

Positioned on the inclined edges 42 of the flanges 40within the envelopeare stampings 45. These stampings have notches 46 adaptable for thereception of a curved portion 47 on the web of the shoe, the shoes beingheld in engagement with the notches in the stampings 45 by a coil spring48 connected to the shoes and bridging the adjustment member.

A modified form of the invention is illustrated in Figures 5, 6 and 7.In this illustrative embodiment of the invention, the actuating meansfor the friction elements is substantially the same as that shown in thepreferred form, the friction elements are of the band type and theadjustment means for the articulated ends thereof is slightly modifiedto provide for this particular structure.

As shown, a stamping is bent on itself to provide an envelope 50comprising parallel side portions 51 and 52 swaged at their center toprovide a sleeve 53 adaptable for the reception of two correspondingplates 54 and 55.

The plates 54 and 55 are swaged so that when assembled, they provide acentral sleeve 56 and the edges of the plates 54 and 55 are inclined inopposite directions as indicated at 57 and 58. The plates 54 and 55 arepositioned in the envelope with the sleeve 56 in the sleeve 53. Thesleeve 56 is internally threaded to receive an adjustment screw 59provided with a square head 60 accessible through an opening 61 in thebacking plate.

As shown, the respective friction elements are formed with lugs 62 and63 and a coil spring 64 is connected between the lugs. This springbridges the adjusting member and serves to retain the'friction elementsin engagement with the adjusting device. The rims of the frictionelements are beveled in opposite directions and are arranged to engagethe bevelled edges on the plates 54 and 55. By rotating the screw 59,the relative position of the articulated ends of the friction elementsmay be readily adjusted.

In operation, when a pull is exerted on the operating cable 30, force isimposed between therollers 28 on the respective friction elementstending to spread the friction elements against the interior of thedrum. Upon initial movement,

the primary shoe engages the interior of the drum connection withcertain specific embodiments, the

principles involved are susceptible of numerous other applications thatwill readily occur to per- 1 sons skilled in the art. The invention is,therefore, to be limited only as indicated by the scope of the appendedclaims. The above-described adjustments are claimed in my divisionalapplication No'. 718,960, filed February 4, 1934.

Having thus described the various features of the invention. what Iclaim as new and desire to.

secure by Letters Patent is:

3. A brake comprising a fixed support, an an chor on the support, afriction element positioned for movement on the support havingoppositely disposed slots and adapted to engage the anchor, rollerspositioned in the slots having a drag on the fixed support and a membermovable between the rollers. v

4. A brake comprising a fixedsupport, an anchor on the support, afriction element having separable ends engagingthe anchor, rollerspositioned for rotation on the separable ends having a drag on thebacking plate and a wedge shaped member. positioned for movement betweenthe rollers. I

5. A brake comprising a fixed support, an anchor on the support, afriction element having separable ends notched to receive the anchor,rollers on the separable ends of the friction element engaging the fixedsupport and a wedge shaped member movable between the rollers.

6. A brake comprising a fixed support, an anchor on the support, afriction element having separable ends notched to receive the anchor,rollers arranged in pairs on the separable ends, the rollers in eachpair having different diameters, the rollers having the larger diametersengaging the fixed support and a wedge shaped member movable between therollers having the smaller diameter.

'7. A brake comprising a fixed support, an anchor positioned thereon, afriction element having separable ends notched to receive the anchorand'provided'with slots, rollers arranged in pairs in the slots, eachpair having a small roller positioned adjacent the rim of the frictionelement and a large roller positioned flush against the small roller andengaging the fixed support and a wedge shaped member movable between thesmall rollers and guided by the rim of the friction element and thesides of the large rollers.

8. A brake comprising a fixed support, an anchor positioned thereon, afriction element movable on the support having separable ends notched toreceive the anchor and provided with alined slots, rollers mounted inpairs in the slots, each pair comprising a small roller and a largeroller, the small roller being flush against the rim of thefrictionelement and the larger being flush against the smaller rollerand engaging the fixed support, a bracket on the fixed support, anoperating cable extending through the bracket, a wedge shaped membersecured to the operating cable and movable thereby between the smallerrollers and guided by the rim of the friction element and the largerrollers and a compression member on the operating cable between thewedge shaped member and the bracket.

ROBERT F. KOHR.

